18 Apr MPS engages first Certified Laboratory Partner for testing and piloting its Glycine Leaching Process (2018)
MPS is pleased to announce that it has executed a partner agreement with Hazen Research, based in Golden, Colorado. The agreement licenses Hazen to independently undertake bench and pilot work using the GlyLeach and GlyCat Process for its clients and for any clients referred to them by MPS.
The agreement is a first in MPS’ Certified Laboratory Partner (CLP) program where laboratories globally are to be engaged to provide mining companies with an additional option to that provided by MPS at their Perth facilities.
The laboratories for the CLP program are carefully selected based on their independence and reputation for quality of work and service.
Operations Director, Tim Newton, commented that “Hazen Research was an obvious first choice for us in implementing our CLP program. The Hazen team has a great reputation amongst mining companies who use them, and they have been in business for over 55 years providing chemical analyses, bench-scale work, and continuous pilot plant demonstrations. Their facilities are first class and their location in the US provides MPS with global reach that we would not otherwise be able to establish“.
GlyLeach is an environmentally benign hydrometallurgical process that will leach base and precious metals from oxide, mixed oxide, supergene, and some primary sulphide ores. Glycine is the simplest amino acid and is available in bulk quantities. Its unique properties can offer substantial advantages over conventional lixiviants:
- Environment / safety: Glycine is non-toxic to humans as well as wildlife
- Selectivity: Glycine will solubilise copper, nickel, cobalt and zinc, while iron, manganese, silicates and carbonates remain in the solid phase
- Alkalinity: Leach conditions are at high pH, allowing simple and inexpensive materials of construction
- Mild conditions: Leaching is typically at ambient temperature with no heating cost or pressure vessels
- Low consumption: Glycine is non-volatile (unlike cyanide, ammonia, hydrochloric acid) and stable under process conditions.
- Recycle: Glycine is not chemically consumed in the overall process. It is easily recovered and recycled, and process losses can be minimised by good design.
Small amounts of cyanide used in conjunction with a glycine-dominant lixiviant has many beneficial properties, particularly for the leaching of precious metals with elevated copper content. This is a consequence of copper preferentially bonding to glycine rather than cyanide, thus freeing the cyanide to leach gold. Furthermore, the cupric glycinate is an effective oxidant for gold and replaces the need for free oxygen in the solution. Benefits include:
- Lower cost:
- A small addition of glycine can cause a marked reduction in cyanide consumption;
- The main glycine reagent is recovered and recycled;
- Free and WAD cyanide in the leach tails are below the limits for disposal prescribed by the International Cyanide Management Code, thus avoiding costly detoxification.
- Catalysis: Gold extraction can be significantly faster than with cyanide alone.
- Problematic ores: GlyCat enables economical gold extraction from ores with elevated soluble copper
Alternative catalysts are under development for an entirely cyanide-free process.
For further enquiries contact:
Ivor Bryan, Managing Director
Mining and Process Solutions
Ph: +61 419 801 145
Nick Hazen, President
Hazen Research, Inc.
Ph: +1 303 279 4501